I don't think that they'd do that, as they'd severely limit their audience. HL2 and eps 1 and 2 were released on all consoles through Orange Box, so I don't see why they wouldn't do a wide release for this one as well.

Source 2 has only beenin development for 2 and a half years, it took 6 years for Half Life 2 to come out after the first game. Unless they doubled the amount of developers before they began work on Source 2 then it's likely still a while off.

I personally expected Doom 4 and Half Life 3 to release near each other like similarly in 2004, this time we may see Doom 4 a fair bit earlier but who knows.

I can't wait to see how performance scales on both game engines and i hope i can buy a high end graphics card and get 60fps or greater at 1080p, unlike in 2004 where Doom 3 and HL2 struggled in some areas and got as low as 20fps on my new 6800 Ultra.